From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Subject: Re: Re: DSDT Change (Compaq Presario 2100) Date: Sat, 3 Jul 2004 22:26:49 +0200 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <20040703202649.GA31892@elf.ucw.cz> References: <200405291345.51712.andre@eisenbach.com> <20040628213409.GA19468@elf.ucw.cz> <20040702115454.GA12889@elf.ucw.cz> <40E59C64.9050603@eisenbach.com> <20040702192152.GB10138@elf.ucw.cz> <20040703003713.GG3889@elf.ucw.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Michael Frank Cc: Andre Eisenbach , Erik Meitner , acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org Hi! > >>The AC adapter produces a voltage which gets stepped down in > >>the box to power the bus to which battery and rest of system connect. > >> > >>The additional temperature rise can be explained by the additional > >>heat generated in this circutry or other than that, perhaps CPU core > >>voltage is increased when on AC accounting for the increase in > >>power consumption. Note that in this case your DSDT change > >>my run the CPU "too fast" for it's Vcore on battery... > > > >Increasing Vcore on AC when it can run on lower Vcore and same clock > >on battery would be pretty strange, no? > > Considering the original system behavior, it is not strange at all. > IMO they have a simple implemententation of 2 Vcores and 2 > frequencies and switch to the lower one one battery. > > As it t would not make sense to reduce clock frequency without > reducing Vcore, my concern is that the "design change" increasing > the frequency may have unexpected side effects. > > Thus right now the system seems "overclocked" on battery and > I suggest again to find a way to measure Vcore to be sure... Well, I'd expect it to crash it faster on fast clock but low voltage... He did some stress testing and it worked well... Undervolting cpu should not really be dangerous for the hardware (but is bad idea if you care about your data), right? Pavel -- People were complaining that M$ turns users into beta-testers... ...jr ghea gurz vagb qrirybcref, naq gurl frrz gb yvxr vg gung jnl! ------------------------------------------------------- This SF.Net email sponsored by Black Hat Briefings & Training. Attend Black Hat Briefings & Training, Las Vegas July 24-29 - digital self defense, top technical experts, no vendor pitches, unmatched networking opportunities. Visit www.blackhat.com